internal Expression <Func <T, bool> > GetExpression(IFilterStatement statement)
{
var builder = new FilterBuilder(new BuilderHelper());
var exp = builder.GetExpression <T>(this);
return(exp);
}
private Expression GetExpression(ParameterExpression param, IFilterStatement statement, string propertyName = null)
{
Expression resultExpr = null;
var memberName = propertyName ?? statement.PropertyId;
Expression member = helper.GetMemberExpression(param, memberName);
if (Nullable.GetUnderlyingType(member.Type) != null && statement.Value != null)
{
resultExpr = Expression.PropertyOrField(member, "HasValue");
member = Expression.PropertyOrField(member, "Value");
}
var safeStringExpression = GetSafeStringExpression(member, statement);
resultExpr = resultExpr != null?Expression.AndAlso(resultExpr, safeStringExpression) : safeStringExpression;
resultExpr = GetSafePropertyMember(param, memberName, resultExpr);
if ((statement.Operation == Operation.IsNull || statement.Operation == Operation.IsNullOrWhiteSpace) && memberName.Contains("."))
{
resultExpr = Expression.OrElse(CheckIfParentIsNull(param, member, memberName), resultExpr);
}
return(resultExpr);
}
public IFilterStatementConnection By <TPropertyType>(FilterStatement <TPropertyType> filter)
{
IFilterStatement statement = filter;
_statements.Add(statement);
return(new FilterStatementConnection <T>(this, statement));
}
private Expression GetSafeStringExpression(Expression member, IFilterStatement statement)
{
var operation = statement.Operation;
if (member.Type != typeof(string))
{
return(GetSafeExpression(member, statement));
}
Expression newMember = member;
if (operation != Operation.IsNullOrWhiteSpace && operation != Operation.IsNotNullNorWhiteSpace)
{
var trimMemberCall = Expression.Call(member, helper.trimMethod);
newMember = Expression.Call(trimMemberCall, helper.toLowerMethod);
}
Expression resultExpr = operation != Operation.IsNull ?
GetSafeExpression(newMember, statement) :
GetSafeExpression(member, statement);
if (member.Type == typeof(string) && new[] { Operation.IsNull, Operation.IsNullOrWhiteSpace, Operation.IsNotNullNorWhiteSpace }.Contains(operation) == false)
{
Expression memberIsNotNull = Expression.NotEqual(member, Expression.Constant(null));
resultExpr = Expression.AndAlso(memberIsNotNull, resultExpr);
}
return(resultExpr);
}
private static Expression GetExpression(ParameterExpression param, IFilterStatement statement, string propertyName = null)
{
Expression resultExpr = null;
var memberName = propertyName ?? statement.PropertyId;
MemberExpression member = param.GetMemberExpression(memberName);
if (Nullable.GetUnderlyingType(member.Type) != null && statement.Value != null)
{
resultExpr = Expression.Property(member, "HasValue");
member = Expression.Property(member, "Value");
}
var constant1 = Expression.Constant(statement.Value);
var constant2 = Expression.Constant(statement.Value2);
CheckPropertyValueMismatch(member, constant1);
var safeStringExpression = statement.Operation.GetExpression(member, constant1, constant2);
resultExpr = resultExpr != null?Expression.AndAlso(resultExpr, safeStringExpression) : safeStringExpression;
resultExpr = GetSafePropertyMember(param, memberName, resultExpr);
if (statement.Operation.ExpectNullValues && memberName.Contains("."))
{
resultExpr = Expression.OrElse(CheckIfParentIsNull(param, memberName), resultExpr);
}
return(resultExpr);
}
public IFilterStatementConnection <TClass> By <TPropertyType>(string propertyName, Operation operation, TPropertyType value, FilterStatementConnector connector = FilterStatementConnector.And)
{
IFilterStatement statement = null;
statement = new FilterStatement <TPropertyType>(propertyName, operation, value, connector);
_statements.Add(statement);
return(new FilterStatementConnection <TClass>(this, statement));
}
public IFilterStatementConnection <TClass> By <TPropertyType>(string propertyName, Operation operation, TPropertyType value, FilterStatementConnector connector = FilterStatementConnector.And, bool?isReplaceAllSpace = false)
{
_isReplaceAllSpace = isReplaceAllSpace;
IFilterStatement statement = null;
statement = new FilterStatement <TPropertyType>(propertyName, operation, value, connector);
_statements.Add(statement);
return(new FilterStatementConnection <TClass>(this, statement));
}
private Expression ProcessListStatement(ParameterExpression param, IFilterStatement statement)
{
var propertyName = statement.PropertyId.Replace("[", "").Replace("]", "");
var listItemParam = Expression.Parameter(param.Type, "i");
var lambda = Expression.Lambda(GetExpression(listItemParam, statement, propertyName), listItemParam);
var member = helper.GetMemberExpression(param, propertyName);
var enumerableType = typeof(Enumerable);
var anyInfo = enumerableType.GetMethods(BindingFlags.Static | BindingFlags.Public)
.First(m => m.Name == "Any" && m.GetParameters().Count() == 2);
anyInfo = anyInfo.MakeGenericMethod(param.Type);
return(Expression.Call(anyInfo, member, lambda));
}
static Expression GetExpression(ParameterExpression param, IFilterStatement statement, string propertyName = null)
{
Expression member = GetMemberExpression(param, propertyName ?? statement.PropertyName);
Expression constant = Expression.Constant(statement.Value);
if (statement.Value is string)
{
var trimMemberCall = Expression.Call(member, trimMethod);
member = Expression.Call(trimMemberCall, toLowerMethod);
var trimConstantCall = Expression.Call(constant, trimMethod);
constant = Expression.Call(trimConstantCall, toLowerMethod);
}
return(Expressions[statement.Operation].Invoke(member, constant));
}
private static IList ValueList(IFilterStatement statement)
{
var type = statement.GetPropertyType();
var myList = (IList)Activator.CreateInstance(typeof(List <>).MakeGenericType(type), statement.Value);
if (type == typeof(string))
{
for (var itemIndex = 0; itemIndex < myList.Count; itemIndex++)
{
myList[itemIndex] = (myList[itemIndex] as string)?.Trim().ToLower();
}
}
return(myList);
}
private Expression ProcessListStatement(ParameterExpression param, IFilterStatement statement)
{
var basePropertyName = statement.PropertyName.Substring(0, statement.PropertyName.IndexOf("["));
var propertyName = statement.PropertyName.Replace(basePropertyName, "").Replace("[", "").Replace("]", "");
var type = param.Type.GetProperty(basePropertyName).PropertyType.GetGenericArguments()[0];
ParameterExpression listItemParam = Expression.Parameter(type, "i");
var lambda = Expression.Lambda(GetExpression(listItemParam, statement, propertyName), listItemParam);
var member = GetMemberExpression(param, basePropertyName);
var enumerableType = typeof(Enumerable);
var anyInfo = enumerableType.GetMethods(BindingFlags.Static | BindingFlags.Public).First(m => m.Name == "Any" && m.GetParameters().Count() == 2);
anyInfo = anyInfo.MakeGenericMethod(type);
return(Expression.Call(anyInfo, member, lambda));
}
private Expression GetExpression(Expression parameter, IFilterStatement statement, string propertyName = null)
{
if (parameter == null)
{
throw new ArgumentNullException(nameof(parameter));
}
if (statement == null)
{
throw new ArgumentNullException(nameof(statement));
}
var memberName = propertyName ?? statement.Property;
var member = this.GetMemberExpression(parameter, memberName);
var constant = this.GetConstantExpression(statement.Value);
var constant2 = this.GetConstantExpression(statement.Value2);
Expression expression = null;
if (Nullable.GetUnderlyingType(member.Type) != null && statement.Value != null)
{
member = Expression.Property(member, "Value");
expression = Expression.Property(member, "HasValue");
}
var stringExpression = this.GetStringExpression(member, statement.Operation, constant, constant2);
expression = expression != null?Expression.AndAlso(expression, stringExpression) : stringExpression;
if (memberName.Contains("."))
{
var parentName = memberName.Substring(0, memberName.IndexOf(".", StringComparison.Ordinal));
var parentMember = this.GetMemberExpression(parameter, parentName);
expression = statement.Operation == Operation.IsNull || statement.Operation == Operation.IsNullOrWhiteSpace
? Expression.OrElse(Expression.Equal(parentMember, Expression.Constant(null)), expression)
: Expression.AndAlso(Expression.NotEqual(parentMember, Expression.Constant(null)), expression);
}
return(expression);
}
private Expression GetArrayExpression(Expression parameter, IFilterStatement statement)
{
if (parameter == null)
{
throw new ArgumentNullException(nameof(parameter));
}
if (statement == null)
{
throw new ArgumentNullException(nameof(statement));
}
var baseName = statement.Property.Substring(0, statement.Property.IndexOf("[", StringComparison.Ordinal));
var type = parameter.Type.GetProperty(baseName).PropertyType.GetGenericArguments()[0];
var name = statement.Property.Replace(baseName, "").Replace("[", "").Replace("]", "");
var methodInfo = typeof(Enumerable).GetMethods(BindingFlags.Static | BindingFlags.Public).First(m => m.Name == "Any" && m.GetParameters().Length == 2).MakeGenericMethod(type);
var member = this.GetMemberExpression(parameter, baseName);
var itemParameter = Expression.Parameter(type, "i");
var expression = Expression.Lambda(GetExpression(itemParameter, statement, name), itemParameter);
return(Expression.Call(methodInfo, member, expression));
}
private Expression GetConstantExpression(Expression member, IFilterStatement statement)
{
var value = statement.Value;
if (value == null)
{
return(null);
}
Expression constant = Expression.Constant(value);
if (value is string)
{
var trimConstantCall = Expression.Call(constant, helper.trimMethod);
constant = Expression.Call(trimConstantCall, helper.toLowerMethod);
}
else if (statement.ValueIsList())
{
var myList = ValueList(statement);
constant = Expression.Constant(statement.Operation == Operation.Between ? new ArrayList(myList).ToArray(statement.GetPropertyType()) : myList);
}
return(constant);
}
private Expression GetSafeExpression(Expression member, IFilterStatement statement)
{
var operation = statement.Operation;
var matchType = new OperationHelper().FetchMatchType(operation, statement.MatchType);
var constant = GetConstantExpression(member, statement);
if (operation != Operation.Between && statement.ValueIsList())
{
if (operation == Operation.EqualTo && matchType == MatchType.Any)
{
return(Expressions[Operation.Contains].Invoke(member, constant));
}
else if (operation == Operation.NotEqualTo && matchType == MatchType.All)
{
return(Expressions[Operation.DoesNotContain].Invoke(member, constant));
}
else
{
var runningExpression = null as Expression;
var myList = ValueList(statement);
var connector = matchType == MatchType.Any ? Connector.Or : Connector.And;
foreach (var item in myList)
{
Expression loopConstant = Expression.Constant(item);
var loopExpression = Expressions[operation].Invoke(member, loopConstant);
runningExpression = runningExpression == null ? loopExpression : CombineExpressions(runningExpression, loopExpression, connector);
}
return(runningExpression ?? Expression.Constant(true));
}
}
return(Expressions[operation].Invoke(member, constant));
}
private static bool IsList(IFilterStatement statement) => statement.PropertyId.Contains("[") && statement.PropertyId.Contains("]");
public FilterStatementConnection(IFilter <TClass> filter, IFilterStatement statement)
{
_filter = filter;
_statement = statement;
}
private static bool IsList(IFilterStatement statement)
{
return(statement.PropertyId.Contains("[") && statement.PropertyId.Contains("]"));
}
internal Expression GetPartialExpression(ParameterExpression param, ref Connector connector, IFilterStatement statement)
{
Expression expr = null;
if (IsList(statement))
{
expr = ProcessListStatement(param, statement);
}
else
{
expr = GetExpression(param, statement);
}
connector = statement.Connector;
return(expr);
}
internal FilterStatementConnection(IFilter filter, IFilterStatement statement)
{
_filter = filter;
_statement = statement;
}
private static Expression GetExpression(ParameterExpression param, IFilterStatement statement, string propertyName = null, bool?isReplaceAllSpace = false)
{
Expression member = GetMemberExpression(param, propertyName ?? statement.PropertyName);
Expression constant;
if (statement.Value == null)
{
if (statement.Operation == Operation.IsEmpty || statement.Operation == Operation.IsNotEmpty)
{
return(Expressions[statement.Operation].Invoke(member, Expression.Constant(string.Empty)));
}
if (member.Type == typeof(DateTime))
{
return(Expressions[statement.Operation].Invoke(member, Expression.Constant(DateTime.MinValue)));
}
return(Expressions[statement.Operation].Invoke(member, Expression.Constant(statement.Value)));
}
var currentStatementValueType = statement.Value.GetType();
if (currentStatementValueType == typeof(string))
{
if (member.Type == typeof(string))
{
constant = Expression.Constant(statement.Value, typeof(string));
var trimMemberCall = Expression.Call(member, trimMethod);
if (isReplaceAllSpace.Value)
{
var toLowerCall = Expression.Call(trimMemberCall, toLowerMethod);
var constant1 = Expression.Constant(" ", typeof(string));
var constant2 = Expression.Constant(string.Empty, typeof(string));
member = Expression.Call(toLowerCall, replaceMethod, constant1, constant2);
}
else
{
member = Expression.Call(trimMemberCall, toLowerMethod);
}
var trimConstantCall = Expression.Call(constant, trimMethod);
constant = Expression.Call(trimConstantCall, toLowerMethod);
}
else
{
Type u = Nullable.GetUnderlyingType(member.Type);
if (u != null && u == typeof(int))
{
int?converted = statement.Value.ToString().ToNullableInt();
constant = Expression.Constant(converted);
}
else if (member.Type.GetTypeInfo().IsEnum)
{
constant = Expression.Constant(Enum.Parse(member.Type, statement.Value.ToString()));
}
else if (member.Type == typeof(DateTime))
{
var converted = DateTime.Parse(statement.Value.ToString()).ToUniversalTime();
constant = Expression.Constant(converted);
}
else
{
var parseMethod = member.Type.GetMethod("Parse", new[] { typeof(string) });
var converted = parseMethod.Invoke(null, new[] { statement.Value });
constant = Expression.Constant(converted);
}
}
}
else
{
constant = Expression.Constant(statement.Value);
var parseMethod = currentStatementValueType.GetMethod("Parse", new[] { typeof(string) });
UnaryExpression converted = Expression.Convert(member, typeof(decimal), parseMethod);
return(Expressions[statement.Operation].Invoke(converted, constant));
}
return(Expressions[statement.Operation].Invoke(member, constant));
}
